I don't understand the implicit vision of World War III that underlies this rationale. Is it supposed to be a multi-year total war affair between major powers, but strictly non-nuclear, like WW II before August 1945? All of the world's major military powers and a few minor ones now have nuclear weapons. And even if they didn't have nuclear weapons, conventional weapons have radically improved effectiveness because of radically improved targeting. (Most of WW II's bombs were wasted destroying random patches of nothing-in-particular instead of the factory or airfield that was being targeted.) The probable timeline from initiation of total war to comprehensive devastation has been heavily compressed since 1940.

If there were total war again between major military powers I could see a brutal spasm of months of using conventional weapons followed by nuclear murder-suicide from whichever side is losing worst. Perhaps a negotiated peace if the winning side doesn't make the losing believe it has nothing left to lose. I don't see it going on for years either way. Preparing to fight the next World War as if it were going to be as protracted as the last one is strange.

Could we not discontinue the legal use of food production for biofuels, pay for those crops to continue to be harvested (readiness payments), and then gave the crops away for free to those in need within the country?

It doesn't quite just work that way. For example, the corn grown for ethanol production is really no good for people to eat.

edit (too deep to reply): I really don't think it's moving the goal posts, you asked about redirecting that food production in general, not soy. As is mentioned elsewhere, the soy oil isn't really used much for food anyway.

That said - you can't just swap corn grown for ethanol for "corn for people to eat" - the equipment involved to harvest it is completely different, as are the facilities to process it. The same concerns apply to other crops.

We're talking soybeans at the moment. This is moving the goal posts. If you can't eat corn-based ethanol corn, you grow other crops on that land.

No we could not. That subsidized introduction of available food would shift the whole demand curve.

Farmers currently produce as much food as the market demands, plus some excess capacity is converted biofuels. If the market required less, they would (eventually) produce less unsubsidized food. Then, the logic goes, WW3 takes out a lot of our food and we suffer massive shortages because there is no extra capacity to produce more.